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  <a name="EN-US_TOPIC_0000002164597642"></a><a name="EN-US_TOPIC_0000002164597642"></a>
  <h1 class="topictitle1">Checking the Network Connectivity When GaussDB (DWS) Backup or Restoration Fails</h1>
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    <h4 class="sectiontitle">Fault Symptom</h4>
    <p>If a GaussDB (DWS) backup or restoration job fails, the job details contain information indicating that the Roach command fails to be executed.</p>
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    <h4 class="sectiontitle">Possible Cause</h4>
    <ol>
     <li>The network between the GaussDB (DWS) node and the <span>product</span> is disconnected.</li>
     <li>The firewall is enabled on the GaussDB (DWS) node, but the ports required for GaussDB (DWS) backup and restoration are not enabled.</li>
    </ol>
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    <h4 class="sectiontitle">Suggestion</h4>
    <p>Check the network connectivity by referring to <a href="https://forum.huawei.com/enterprise/en/script-tool-used-to-check-network-connectivity-and-simulate-listening-ports-on-the-server/thread/686333558987309056-667213859733254144" target="_blank" rel="noopener noreferrer">Checking Network Connectivity</a>.</p>
    <ul>
     <li>For cause 1, rectify the network fault.</li>
     <li>For cause 2, open the ports required by the GaussDB (DWS) backup and restoration jobs. For details, see the <a href="https://support.huawei.com/enterprise/en/doc/EDOC1100385843" target="_blank" rel="noopener noreferrer">Communication Matrix</a>.</li>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002164597706.html">FAQs</a>
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